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138-4B — VALVE,FLOW CONTROL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

138-4B: VALVE,FLOW CONTROL.

The VALVE,FLOW CONTROL is a the manufacturer industrial component. Key specifications include thread_class: 2A A, body_material: COPPER ALLOY AND ZINC, connection_type: THREADED EXTERNAL TUBE, flow_control_device: DISK, nominal_thread_size: 0.438 INCHES IN, thread_quantity_per_inch: 20. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-031-4338, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
138-4B
NSN: 4820-01-031-4338
FSC: 4820 — Valves, Nonpowered
CAGE: 86768 — TELEDYNE INDUSTRIES INC TELEDYNE FLUID SYSTEMS REPUBLIC BUSINESS UNIT (USA)
SPECIFICATIONS
thread_class2A A
body_materialCOPPER ALLOY AND ZINC
connection_typeTHREADED EXTERNAL TUBE
flow_control_deviceDISK
nominal_thread_size0.438 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNF
NSN4820-01-031-4338
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 138-4B · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FLOW CONTROL DEVICE: DISK
•
CONNECTION TYPE: THREADED EXTERNAL TUBE
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
BODY MATERIAL: COPPER ALLOY AND ZINC
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEDISK
CONNECTION TYPETHREADED EXTERNAL TUBE
NOMINAL THREAD SIZE0.438 INCHES IN
BODY MATERIALCOPPER ALLOY AND ZINC
SPECIAL FEATURESBODY IS BRASS, CAP IS BRASS, STEM IS STAINLESS STEL PASSIVATED 303, WASHER IS STAINLESS STEEL PASSIVATED 304; PROOF PRESSURE IS 7500.0 PSI; SERVICE HYDRAULICS AND WATER;CAPABLE OF WINDSTANDING A STOCK TEST PER MIL-S-901;NHA IS 11620844; SEAT ANGLE IS 37.0 DEGREES
THREAD CLASS2A A
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNF
SUBSTITUTES & CROSS-REFERENCES 2
10086271Reference document
Same NSN cross-reference
Reference document — Informative reference only
102367Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 138-4B?
138-4B is a VALVE,FLOW CONTROL.
What parts can replace 138-4B?
There are 2 known substitutes for 138-4B: 10086271, 102367. Substitute compatibility should be verified for your specific system.
What is the NSN for 138-4B?
138-4B is cataloged in the U.S. Government catalog under NSN 4820-01-031-4338. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.